SINGLE PHASE SERIES AND PARALLEL INVERTER FINAL.ppt

SINGLE PHASE SERIES AND PARALLEL INVERTER

Md mustafa kamal

Introduction A device which converts DC into AC is known as an inverter. It may be defined as the reverse process of rectification. The block diagram representation may be consist of DC Source Oscillator circuit A step up transformer AC output

Classification An inverter can broadly classified into two types

• Voltage source inverter • Current source inverter

Single Phase Series Inverter

The circuit diagram of series inverter is shown in figure. It consist of Load Resistance R in series with Commutating components L and C. The value of L and C are so chosen that the RLC circuit forms an under damped circuit. The two thyristors T1 and T2 are turn on one by one so that

Load Current waveform of the series inverter

The analysis of basic series inverter • Finding the load current i(t) • Voltage across inductance • Voltage across capacitor • Output frequency Example: Calculate the output frequency of a series inverter with the following parameters: Inductance L=6mH, capacitance C=1.2 microfarad, load resistance R=100 ohms, Toff=0.2ms. If the load resistance is varied from 40 to 140 ohms, find out the range of output frequency.

The analysis of basic series inverter

The analysis of basic series inverter

The analysis of basic series inverter

Single Phase Parallel inverter

The Basic Inverter circuit for a single phase parallel inverter is shown in figure. It consist of two thyristors T1 and T2 and inductor L and capacitor commutated with centre tapped transformer. The out put voltage and current are V and i respectively. 0

0

Operation of Single Phase Parallel inverter The operation of the inverter can be explained in different modes as under Mode I :

Operation of Single Phase Parallel inverter Mode II :

Operation of Single Phase Parallel inverter {Mode II}

Operation of Single Phase Parallel inverter Mode III :

Waveform for currents and voltages

Analysis of Parallel Inverter

Analysis of Parallel Inverter

APPLICATIONS  Industrial applications of inverters are  Adjustable speed ac drives  Induction heating  Standby power supply  UPS for computers  HVDC transmission lines

THANKS